7mm ATCA LO Configuration checker

It was found in November 2013 that the algorithm used to set the LO frequency
chain required to observe in the 7mm band (frequencies between 30 and 50 GHz)
was sometimes causing small frequency offsets. The problem, once discovered,
was quickly fixed, but all observations made in the 7mm band between 2011-April-7
and 2013-December-2 may have suffered because of this fault.

This page is here so you can assess if your observations have been affected
by this problem, and what the frequency offset was. To do this, simply enter
the central frequencies of the two simultaneous IFs you used and
press the "Check" button.

If you have any questions about the problem, or this page, please contact
Jamie Stevens.

Simultaneous central frequencies:IF #1 MHzIF #2 MHz

Your observations are not affected by this bug.

Your observations will have the wrong frequency.

The frequency of IF#1 will actually be MHz,
which is an offset of kHz.

The frequency of IF#2 will actually be MHz,
which is an offset of kHz.

This frequency offset will only be
readily apparent in the 1 MHz zoom bands, which have channel widths of
488 Hz. In the 64 MHz zoom bands, with channel widths of 31.25 kHz, this change
will not be easily seen, but may still have a measurable effect. In the continuum
bands, this offset is unimportant for all but the most precise measurements.